The picture comes amid rumours that Ewan has split from Eve, with PEOPLE quoting a family source confirming that the couple have been split up since May of this year. I made the right choice'. Mavrakis and McGregor were married in 1995, and share four daughters, Clara, 21, Jamyan, 16, Esther, 15 and Anouk, 6.
And in 2010, there were more unkind rumours of a relationship with French actress Melanie Laurent, his co-star on the film Beginners.
In images obtained by The Sun, the TV lovers were allegedly seen getting close at The Good Life Eatery in St. John's Wood.
"Ewan and Mary Elizabeth were there together and seemed relaxed in each other's company", a witness told the publication. "The cafe was really busy and have to go to the counter to order food, so people are up and down constantly".
'They were deep in conversation and were there together for more than an hour.
Winstead, who announced her split from director husband Riley Stearns in May after seven years of marriage, plays Nikki Swango, a recent parolee, in season 3 of Fargo.
Both had joined the FX Network cult hit for its third series, filmed on location in Calgary, Canada. In her statement about the breakup, Winstead called Stears her "best friend". They have four kids together, and the split apparently happened back in May.
"I wasn't sure whether that was a true love or whether she's manipulating him", she said.
'We are still ride or die, just in a different way now.
ET has reached out to McGregor's rep for comment.
In February, Winstead shared a photo with McGregor on her Instagram with the caption, "Pretty lovely Canadian Sunday".
In July 2015 they were pictured together at the Serpentine Gallery's summer party in London's Hyde Park.